Therefore you can't blame Juncker stating the fact that the marriage between GB and the rest of the EU was a somewhat cold love.
The very fact that risking (domino-effect) the future of the EU via this referendum just for some political self-interest (internal power struggle Conservative Party ) illustrates this use-at-will mentality.
I read the British press closely and am astonished by the amount of classlessness many people have regarding this issue. It is in the interest of Europe to not let the trade block crumble. GB knew this was at stake with a brexit.
Now the EU needs to (even if it wouldn't want to) give GB the finger just to make sure this will not become a precedent for many other countries (eg. NL, FR). GB has to pay, even if no one wouldn't want to harm GB.
The risk of a collapsing EU market with investments and trade drying up will have severe consequences world wide.
From a purely rational perspective this was the most stupid action for GB.